43983721 has 2 divisors, whose sum is σ = 43983722. Its totient is φ = 43983720.

The previous prime is 43983703. The next prime is 43983739. The reversal of 43983721 is 12738934.

It is a balanced prime because it is at equal distance from previous prime (43983703) and next prime (43983739).

It can be written as a sum of positive squares in only one way, i.e., 36481600 + 7502121 = 6040^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 43983721 - 2⁷ = 43983593 is a prime.

It is a super-3 number, since 3×43983721³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (43983791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21991860 + 21991861.

It is an arithmetic number, because the mean of its divisors is an integer number (21991861).

Almost surely, 2^43983721 is an apocalyptic number.

It is an amenable number.

43983721 is a deficient number, since it is larger than the sum of its proper divisors (1).

43983721 is an equidigital number, since it uses as much as digits as its factorization.

43983721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 43983721 is about 6632.0223913977. The cubic root of 43983721 is about 352.9912898738.

The spelling of 43983721 in words is "forty-three million, nine hundred eighty-three thousand, seven hundred twenty-one".